Like Zomby said if your tank cap isn't vented properly pressure will build from the gas sloshing around in the tank and the gas will be forced out the fuel line into the carb pushing the float down and flooding out the overflow in the carb untill the pressure is released. That happened to me untill i replaced the gas cap which didn't vent. As far as a rusty tank goes buying a product called Kreem from a motorcycle shop works great to treat the inside of these cheap little gas tanks to make them completely rust proof.
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